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uses jpeg;

{...}

procedure TForm1.Button1Click(Sender: TObject);
begin
if opd.execute then
 image1.Picture.loadfromfile(opd.filename);
end;					

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unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, ExtDlgs, ExtCtrls, StdCtrls;

type
  TForm1 = class(TForm)
    Button1: TButton;
    Image1: TImage;
    OpenPictureDialog1: TOpenPictureDialog;
    procedure Button1Click(Sender: TObject);
  private
    { Private-Deklarationen }
  public
    { Public-Deklarationen }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
begin
If OpenPictureDialog1.Execute Then
Image1.Picture.LoadFromFile(OpenPictureDialog);
end;

end.